Siphon flushing-cistern.



J. HOLT.

SIPHON FLUSHING CISTERN.

APPLICATION FlLED APR.11.1912.

Patented Sept. 21, 1915.

LULUMBIA PLANOCIRAPH CD..WASHINGTGN. n. c.

JAMES HOLT, OF WALLASEY, ENGLAND.

SIPHON FLUSHING-CISTERN.

Application filed April 11, 1912.

1/ '0 all whom it m 01 concern Be it known that I, JAMES How, a subject of the King of Great Britain, and a resident of Vallasey, Cheshire, England, have invented certain new and useful Improvements in or Relating to Siphon Flushing-Cisterns, of which the following is a specification.

This invention relates to improvements in siphon flushing cisternsof that type in which the flush pipe and hell are located in a separate compartment of the cistern from the ball, the flush being started by raising a bell surrounding the inlet of the stand pipe.

The invention is particularly directed to that class of cistern in which the bell is of conical formation the' larger diameter being at the top.

It is a usual requirement of thewater authorities that the upper edge of the stand pipe should be above the top of the cistern, and in those arrangements where the stand pipe is in the same compartment as the ball, owing to the necessary minimum distance of the water level edge of the overflow pipe below the top of the cistern a lift of two and a half to three inches of thewater by means of the hell would be required before the flush could be started, and this has been found to be impracticable; whereas by disposing the stand pipe in a separate compartment from the ball, the level of water in such separate compartment may be brought up to within a quarter ofan inch of the edge of the stand pipe and thus materially facilitate the starting of the Hush.

The invention is illustrated in the accompanying drawings, in which' Figure 1. is a vertical section through a cistern constructed in accordance with this invention, showing one form of the stand pipe trap. Fig. 2. is a fragmentary detail plan view of the trap shown in Fig. 1. Fig. 3. is a fragmentary vertical section of a modified arrangement of the stand pipe and trap. Fig. l. is a plan view in section on the line BB of Fig. 3., and Fig. 5. is a plan view showing a further modification of the trap. Figs. 6. and 7. are a sectional elevation and plan respectively of a further modification of the trap and Fig. 8. shows the application of a hinged form of trap. Fig. 9. is a fragmentary vertical section showing the loose connection between the bell and the operating lever.

Specification of Letters Patent.

Patented Sept. 21, 1915.

Serial No. 690,033.

In carrying out the invention separate stand pipeand ball float compartments are provided in the cistern. The stand pipe 1 is made separate from the down flush pipe 2, the outlet 3 of the stand pipe being disposed within a trough shaped trap 4 of special construction located above the mouth or inlet of the down pipe 2, the flush when started by the lifting of the bell being arranged to pass over the walls of the trap 4: into the down flush pipe 2, the trap thus acting'as a water seal to the stand pipe outlet.

In the form shown in Figs. 1. and 2. the. trap is constructed as an open trough extending diametrically across the down pipe inlet, preferably flared as shown at '2, so that the trap has two side walls or weirs et over which the flush when once started, and after passing the stand pipe 1, overflows into the down pipe. The edges of the weirs a are in this form shown flush with the floorof the cistern. The float chamber 6 of the cistern is a separate compartment, and divided from the, flush or stand pipe compartment 7 by the wall 8 so that the level of water in the, flush compartment may be always brought to the tip l of the stand pipe and thus facilitate starting of the siphonage. The float chamber is emptied by the siphon p p In Fig. 3. the invention is shown applied to a thick walled cistern, in which type the siphon pipe 9 would be let intothe floor 11 of the cistern, as shown, so as to bring the outlet of the siphon pipe as close to the down pipe inlet as possible.

In the modification shown in Fig. 6. the seal trap dis disposed well up in the bell and surrounded and supported as before by the casing 1. This modification is particularly suitable for the case of iron or metal cisterns.

In the form shown in Fig. 8. the trap or receptacle forming the seal is hinged at 4, and so constructed and balanced by the weight 4 that when filled with water and before the main flush has been started the receptacle covers the outlet of the stand pipe and seals it as shown, but the momentum of the flush when started drives it to one side and permits an unimpeded flush taking place down the stand pipe 1 into the down pipe 2.

With all these modifications it is proposed to use a bell of conical formation as shown the large diameter 5 or shoulder of which is disposed beneath the normal water level a. Such a disposition of the bell with reference to the water level assists very effectively inv starting the flush. To assist the siphonic action a small air hole 12 may be provided in the lower part of the stand pipe above the edge of the weir, or a small bore tube 13 may be inserted, as shown in Fig. 1., through the base of the seal trap and arranged to pass up into the interior of the stand pipe above the edge of the weir and consequently above the level of the water in the stand pipe. Such an arrangement of perforation in the stand pipe, or the small bore tube, by putting the down flush pipe into communication with the stand pipe enables a complete siphonage of the water from the cistern to be achieved without any necessity for a flush pipe tobe connected, which is in certain cases required as an efiiciency test. To allow for a slight air passage from the interior to the exterior of the bell the connection between the operating lever 13 and the bell may be made loose as shown in Fig. 9, where the shank 14 of the eye bolt connectingthe bell to the operating lever 13 passes through a clearance orifice 15 in the head of the bell, the

arrangement being such however that the head 16 of the shank closes the orifice 15 when the bell is lifted. I

In order to produce a silencing action in the cistern a bent open-ended tube 17 Fig. 1. may beprovided leading from the lower part of the flush chamber to the inlet of the stand "pipe, the inlet orifice 17 of which becomes exposed to the atmosphere before the cistern is completely emptied. The other end of the tube is carriednear to the stand pipe top, or into the crown of the bell, or it may be carried into the down pipe or trap chamber so as to relieve the pressure gradually, and the inlets on these tubes 17 may be made permanently open or closable by a valve. Or as illustrated'in Fig. 8.I may provide an inner bell 18, having a hole or perforation 19 in the upper part.

I claim: 1. In a flushing apparatus a divided cistern, a stand pipe in the cistern, a flush pipe k secured to the cistern, and in communication with the stand pipe, said flush pipe having a flared extremity, a bell substantially housing the stand pipe, a trough positioned in the flared portion of the flush pipe, said trough having inclined walls adapted to engage the flared walls-of the flush pipe whereby the trough is supported in' -the flush pipe, one end of the stand pipe extending into the trough and terminating below the water :level thereof, an air pipe extending through the bottom of the trough, one end of the said air pipe terminating at a point above the water level of the trough, said; pipe adapted to provide communication between the stand pipe and flush pipe, and means 7 for moving the bell vertically causing water fl u'sh pipe,a silencing .pipe having oneofits ends positioned under one edge of the bell and its opposite 'endq 'extending over the upper edge of the st'ancll-plipe," substantially as describedw In testimony whereof I a fiiX my signature in presence of two witnesses.

. JAMES HOLT, f

Witnesses:

A. J- DAVIES, H. WILLIAMs.

' Copies of this patent may be obtainedfor five cents each, by addressing the Commissioner of ?atents,

I Washington,D. C. 

